Polywell Ignition X7900i-3960

Both the side panels eschew thumbscrews in favor of a key-and-knob locking mechanism. The knob is found on either side of the rear panel: Turn it one way to free the panel, which you can then just pull away; turn it back the other way to secure it...

Excellent performance. Outstanding selection of preinstalled hardware

Not the fastest performer out there. No factory overclocking. Few USB 3.0 ports

The Polywell Poly Ignition X7900i-3960 is a terrifically powerful desktop, but not quite the fastest Core i7-3960X PC you can buy.